@article{10_1017_S0017089500007734,
     author = {Smith, Howard},
     title = {On torsion-free hypercentral groups with all subgroups subnormal},
     journal = {Glasgow mathematical journal},
     pages = {193--194},
     year = {1989},
     volume = {31},
     number = {2},
     doi = {10.1017/S0017089500007734},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500007734/}
}